the old man must()politely A.be spoken B.speak C.be spoken to D.be spoken

问题描述:

the old man must()politely A.be spoken B.speak C.be spoken to D.be spoken

c正确。被动语态结构。“对这位老人说话必须有礼貌”

c be spoken to

C.be spoken to
此句是用被动语态表达如下一样的意思:
You(One) must speak to the old man politely.
你(或任何一个人)和长者说话时必须有礼貌.

当然填be啦!这是被动语态的句子,这一类是:can/may/must +be吧! 保证填be,错了找我